<!DOCTYPE html>
<html>
<head>
     <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
     <title></title>
     <meta charset="utf-8" />
     <style>
      .map {
        width: 100%;
        height:400px;
      }
    </style>
</head>
<body>
  <div id='map' class="map"></div>
  <script type="module" src="main.js"></script>
</body>
</html>